'The Pilgrim's Progress' is a famous allegory in prose written by -

The Pilgrim’s Progress, a religious allegory by the English writer John Bunyan, published in two parts in 1678 and 1684.
The work is a symbolic vision of the good man’s pilgrimage through life. At one time second only to the Bible in popularity, The Pilgrim’s Progress is the most famous Christian allegory still in print.
Source: Britannica.com